The Healthraiser is a Legendary 
Daedalus Repkit which is obtainable through the How Rush Saved Mercenary Day exclusive boss, Donk.
Its unique effect spawns health boosters at the start and end of its activation.
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How to Unlock the Legendary Healthraiser Repkit
Legendary Loot
Repkits
Overview
How To Get
Unlock Location + Farm Method:
- Acquire the How Rush Saved Mercenary Day Bounty Pack (this is free!)
- Work your way through the quest starting with The War on Mercenary Day. This can be started by interacting with the present at any majob hub.
- Defeat Donk and/or Minister Screw during the end boss fight in the Ministry of Culture.
Harlowe
Flux Generator
Vex
Dead Ringer
Incarnate
Amon
Crucible